package com.forum.aspect;


import com.forum.annotation.AutoFill;
import com.forum.constant.AutoFillConstant;
import com.forum.context.BaseContext;
import com.forum.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面，实现公共字段自动填充处理逻辑
 */
//切面标识注解
@Aspect
//加入bean
@Component
//记录日志
@Slf4j
public class AutoFillAspect {

    /**
     * 切入点
     */
    @Pointcut("execution(* com.forum.mapper.*.*(..)) && @annotation(com.forum.annotation.AutoFill)")
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint) throws Exception {
        log.info("开始进行公共字段自动填充...");

        //获取到当前被拦截的方法上的数据库操作类型

        MethodSignature signature = (MethodSignature) joinPoint.getSignature();// 方法签名对象
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
        OperationType operationType = autoFill.value(); //获得数据库操作类型

        //获取到当前被拦截的方法的参数--实体对象
        Object[] args = joinPoint.getArgs();
        if (args == null || args.length == 0){
            return;
        }

        Object entity = args[0];

        //准备赋值的数据
        LocalDateTime localDateTime = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据当前不同的操作类型,为对应的属性通过反射来赋值
        if (operationType == OperationType.INSERT){
            //为4个字段赋值
            Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
//            Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
//            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

            //通过反射为对象属性赋值
            setCreateTime.invoke(entity, localDateTime);
//            setCreateUser.invoke(entity, currentId);
            setUpdateTime.invoke(entity, localDateTime);
//            setUpdateUser.invoke(entity, currentId);
        }else if (operationType == OperationType.UPDATE){
            //为2个字段赋值
            Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
//            Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
            setUpdateTime.invoke(entity, localDateTime);
//            setUpdateUser.invoke(entity, currentId);
        }

    }
}
